[wsrp] Various failure types

[Rich Thompson <richt2@us.ibm.com>]

With the decisions to normalize DestroyFailed
and make getPortletLifetime array oriented, we now have quite a few nearly
duplicated structures related to failures. They are currently separate
as they partially specify the semantics internal to the failed structure.
I see no reason these can be consolidated into a type that indicates an
operation failed for a certain set of portlets with the semantics related
to what failed carried entirely at the higher level structure. For example,
if a FailedPortlets structure just carried an array of portletHandles (which
portlets failed), an errorCode and localized reason, then whether it was
included in the ExportPortletsResponse or DestroyPortletsResponse provides
any semantics of what needs to happen as a result of the failure.

I will be reflecting this consolidation
in wd16 unless objections are raised in this email thread ...

Rich